How to Help - Printing Tips - Duplex - Windows
Page address: http://www.mnsu.edu/greencampus/howtohelp/duplexwindows/

- From the menu bar, go to File> Print...
- In the Print dialog window, click on the Properties on your top-right.
- In the Properties window, select the Finishing tab. Under Document Options, check the option to Print On Both Sides.
- Click OK, check other settings like print range and number of copies, then click on Print.